andradite

Thân thiện

A jeweler examines a polished andradite gemstone under a bright light.

Definition

Noun: 1. A mineral, a calcium-iron silicate garnet: A specific type of garnet, which is a silicate mineral. Its chemical composition is calcium iron silicate (Ca₃Fe₂(SiO₄)₃). 2. A gemstone variety of garnet: When of suitable quality, it is cut and used as a gemstone. It can occur in a range of colors including yellow, green, brown, and black.

Usage Examples

• Noun:
  • The geologist identified the dark crystal as andradite.
  • Andradite is one of the most sought-after garnets for collectors.
  • This green variety of andradite is known as demantoid.

Advanced Usage

• Demantoid: A brilliant green variety of andradite, highly valued as a gemstone.
  • Demantoid is the most prized form of andradite.
• Melanite: A black, titanium-rich variety of andradite.
  • The volcanic rock contained crystals of melanite.
• Topazolite: A yellow to yellow-green variety of andradite.
  • Topazolite can resemble the gemstone topaz in color.

Variants and Related Words

• Garnet (n): The broader group of silicate minerals to which andradite belongs.
• Silicate (n): A mineral containing silicon and oxygen, the class to which garnets like andradite belong.
• Demantoid (n): The green gem variety of andradite.
• Melanite (n): The black variety of andradite.

Synonyms

• Garnet (specifically a calcium-iron garnet)
• Gemstone (when referring to its use as a jewel)

Notes on Different Meanings

The word andradite has a single, specific meaning in mineralogy and gemology. It does not have multiple common meanings. It refers exclusively to the mineral with the chemical formula Ca₃Fe₂(SiO₄)₃ within the garnet group.

Học thuật

Noun

1. a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone